A simple Joule Thief circuit.

A simple single transistor Joule Thief circuit. To run this simulation, click on "Open in Editor" then do: Ctrl+R save the file when prompted and then do: Ctrl+R > Transient > Run A simple single transistor Joule Thief circuit. See: http://en.wikipedia.org/wiki/Joule_thief for background and other links. R1 represents the source resistance of the input supply. V1 is a pulse source set to ramp up VCC from 0V to 1.5V to kick the circuit into oscillation. The circuit will start with V1 set to a simple 1.5V source but will take a little longer to build up to full oscillations. Note that the so-called Joule Thief is an example of a type of circuit referred to as a Blocking Oscillator: https://en.wikipedia.org/wiki/Blocking_oscillator